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| | <StructureSection load='4nk2' size='340' side='right'caption='[[4nk2]], [[Resolution|resolution]] 1.96Å' scene=''> | | <StructureSection load='4nk2' size='340' side='right'caption='[[4nk2]], [[Resolution|resolution]] 1.96Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4nk2]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Meti4 Meti4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NK2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4NK2 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4nk2]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Methylacidiphilum_infernorum_V4 Methylacidiphilum infernorum V4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NK2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4NK2 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Minf_1222 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=481448 METI4])</td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4nk2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4nk2 OCA], [https://pdbe.org/4nk2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4nk2 RCSB], [https://www.ebi.ac.uk/pdbsum/4nk2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4nk2 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4nk2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4nk2 OCA], [http://pdbe.org/4nk2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4nk2 RCSB], [http://www.ebi.ac.uk/pdbsum/4nk2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4nk2 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/B3DVC3_METI4 B3DVC3_METI4] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Meti4]] | + | [[Category: Methylacidiphilum infernorum V4]] |
| - | [[Category: Jamil, F]] | + | [[Category: Jamil F]] |
| - | [[Category: Heme]]
| + | |
| - | [[Category: Hemoglobin]]
| + | |
| - | [[Category: Oxygen binding]]
| + | |
| - | [[Category: Truncated]]
| + | |
| - | [[Category: Truncated hemoglobin]]
| + | |
| Structural highlights
Function
B3DVC3_METI4
Publication Abstract from PubMed
A truncated haemoglobin (tHb) has been identified in an acidophilic and thermophilic methanotroph Methylacidiphilium infernorum. Hell's Gate Globin IV (HGbIV) and its related tHbs differ from all other bacterial tHbs due to their distinctively large sequence and polar distal haem pocket residues. Here we report the crystal structure of HGbIV determined at 1.96 A resolution. The HGbIV structure has the distinctive 2/2 alpha-helical structure with extensions at both termini. It has a large distal site cavity in the haem pocket surrounded by four polar residues: His70(B9), His71(B10), Ser97(E11) and Trp137(G8). This cavity can bind bulky ligands such as a phosphate ion. Conformational shifts of His71(B10), Leu90(E4) and Leu93(E7) can also provide more space to accommodate larger ligands than the phosphate ion. The entrance/exit of such bulky ligands might be facilitated by positional flexibility in the CD1 loop, E helix and haem-propionate A. Therefore, the large cavity in HGbIV with polar His70(B9) and His71(B10), in contrast to the distal sites of other bacterial tHbs surrounded by non-polar residues, suggests its distinct physiological functions.
Crystal structure of truncated haemoglobin from an extremely thermophilic and acidophilic bacterium.,Jamil F, Teh AH, Schadich E, Saito JA, Najimudin N, Alam M J Biochem. 2014 Aug;156(2):97-106. doi: 10.1093/jb/mvu023. Epub 2014 Apr 14. PMID:24733432[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Jamil F, Teh AH, Schadich E, Saito JA, Najimudin N, Alam M. Crystal structure of truncated haemoglobin from an extremely thermophilic and acidophilic bacterium. J Biochem. 2014 Aug;156(2):97-106. doi: 10.1093/jb/mvu023. Epub 2014 Apr 14. PMID:24733432 doi:http://dx.doi.org/10.1093/jb/mvu023
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